热变形对0．05C-0．13Nb钢组织和显微硬度的影响  

Effect of Hot Deformation on Structure and Microhardness of 0.05C-0.13Nb Steel

作　　者：阴树标[1] 刘清友[2] 张志波[2] 孙新军[2] 雷霆[1] 

机构地区：[1]昆明理工大学材料与冶金工程学院,昆明6300912 [2]钢铁研究总院结构材料研究所,北京100081

出　　处：《特殊钢》2008年第1期25-27,共3页Special Steel

基　　金：973国家重点基础研究基金(2004cb619101)

摘　　要：用Thermecomastor-Z热模拟试验机,研究了0.05C-0.13Nb钢单道次1000℃、2s^(-1)变形40%和双道次1000℃、2s^(-1)变形40%+980℃+5s^(-1)变形40%后冷却速度、变形量、原始奥氏体晶粒度和应变速率对组织和显微硬度(HV)的影响。结果表明,冷却速度增加,钢中粒状贝氏体逐渐增多,冷却速度达5℃/s时,贝氏体含量达93%,HV值显著增加;当冷却速度超过5℃/s时,贝氏体岛状组织形貌改变,HV值增加较小;随原始奥氏体晶粒尺寸减小和变形量增大,HV值减小,应变速率对HV值无显著影响。The effect of cooling rate, reduction, original austenite grain size and strain rate of 0. 05C-0. 13Nb steel after single pass-reduction 40% with 2 s^-1 at 1 000℃ or two pass-reduction 40% with 2 s^-1 at 1 000 ℃ ＋ reduction 40% with 5 s^- 1 at 980℃ on structure and microhardness HV has been studied by Thermecmastor-Z thermal simulation test machine. Results indicated that with increasing cooling rate the granular bainite gradually increased, of which the content was up to 93% as cooling rate was to 5 ℃/s, and the HV value obviously increased, while cooling rate was more than 5 ℃/s the morphology of bainite island structure was changed and the HV value increased little; with decreasing original austenite grain size and increasing reduction the HV value decreased; but the effect of strain rate on HV value was not appreciable.

关 键 词：0.05-0.13Nb钢 热变形 组织 HV值 

分 类 号：TG142.15[一般工业技术—材料科学与工程]